Goodies option:
Press Triangle, Square, Circle, Left, Square, Triangle, Square, Circle,
Left, Square within three seconds at the "Press Start" screen. An
additional selection will appear at the end of the options menu that allows
level selection, all weapons, unlimited ammunition, and the ability to view
the FMV sequences.
Stage select:
Enable the "Goodies option" code. Then, press Left, Right, X, Triangle,
Left, Up within three seconds at the "Press Start" screen. A white screen
flash, sound effect, and display of the cheat name will confirm correct
code entry. An option that will allow selection of an individual stage
within a level will become available. Note: Enabling this code may cause
music and graphic problems.
Nakomi mode:
Press Up(2), Down(2), Left, Right, Left, Right, X, Circle within three
seconds at the "Press Start" screen. A white screen flash, sound effect,
and display of the cheat name will confirm correct code entry. All 3D
characters except the Boss will be flattened.
Big head player:
Press Square, Circle(2), Square, Up, Square, Circle(2), Square, Triangle
within three seconds at the "Press Start" screen. A white screen flash,
sound effect, and display of the cheat name will confirm correct code
entry.
Big head aliens:
Press Square, Circle(2), Square, Up, Square, Circle(2), Square, X within
three seconds at the "Press Start" screen. A white screen flash, sound
effect, and display of the cheat name will confirm correct code entry.
Note: This code does not affect the Boss.
Turbo mode:
Press X, Square, Triangle, Circle, X, Square, Triangle, Circle, L2, R2
within three seconds at the "Press Start" screen. A white screen flash,
sound effect, and display of the cheat name will confirm correct code
entry. Press Circle during game play to run faster. Note: This will also
use any item currently being held by your character.
Grayscale graphics:
Press X(2), Triangle(2), Square(2), Circle(2), Up, Down within three
seconds at the "Press Start" screen. A white screen flash, sound effect,
and display of the cheat name will confirm correct code entry.
Sepia graphics:
Press Left(10) within three seconds at the "Press Start" screen. A white
screen flash, sound effect, and display of the cheat name will confirm
correct code entry.
Bonus stages:
The Queen Chamber and Greenhouse stages can be played only after
completing level 7 in two player mode.
Special power-up:
A special power-up marked with an exclamation point can be found at the
following locations. It allows your character to receive all available
weapons at maximum power and an ammunition recharge item. In one player
mode, find the long series of platforms that can be destroyed
approximately half way through the Tube 1 level. A hovering destructible
platform under the special power-up is located behind the fourth
destructible platform. In two player mode, find the series of rope
bridges towards the end of the Jungle Crash Site level. After the third
rope bridge is a column with alien gun emplacements and a power-up
towards the rear of the screen. Destroy the alien guns and jump out
towards the column to land on an invisible platform. Walk along that
platform on to the column to collect the power-up.
Faster charge:
Collect an ammunition recharge item and place it in your inventory to
increase the rate of charge.
Weapon upgrade power-up:
Hold all weapons that are available for your character when approaching
a normal weapons crate. Instead of the weapon, the crate will contain a
weapon upgrade power-up when destroyed.
